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id="post-info"><h1 class="post-title">NodeJs</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2019-03-24T16:00:00.000Z" title="发表于 2019-03-25 00:00:00">2019-03-25</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2019-06-02T16:00:00.000Z" title="更新于 2019-06-03 00:00:00">2019-06-03</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/Node/">Node</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">2.1k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>9分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="NodeJs"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h1 id="node-基础"><a href="#node-基础" class="headerlink" title="node 基础"></a>node 基础</h1><h2 id="node的常用模块"><a href="#node的常用模块" class="headerlink" title="node的常用模块"></a>node的常用模块</h2><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">1.核心模块 global buffer module process </span><br><span class="line">2.内置模块 os fs path http event</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span>核心模块</span><br><span class="line">buffer 主要处理二进制数据流 alloc <span class="keyword">from</span> write contact toString</span><br><span class="line"><span class="built_in">module</span> 比如 <span class="built_in">require</span>(引入模块) <span class="built_in">module</span>.exports(导出模块) </span><br><span class="line"><span class="number">2.</span>内置模块</span><br><span class="line">os(内存) fs(读取文件) path(路径) http(协议) event(事件)</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//示例</span></span><br><span class="line"><span class="keyword">const</span> os = <span class="built_in">require</span>(<span class="string">&#x27;os&#x27;</span>) <span class="comment">//内存模块</span></span><br><span class="line"><span class="comment">//比如我现在想看 内存使用了多少</span></span><br><span class="line"><span class="comment">// os.freemem() 空闲内存量 os.totalmem() 总内存量</span></span><br><span class="line"><span class="keyword">const</span> men = os.freemem() / os.totalmem()</span><br><span class="line"><span class="built_in">console</span>.log(<span class="string">&#x27;内存使用情况&#x27;</span>,men)</span><br></pre></td></tr></table></figure>
<h2 id="下载"><a href="#下载" class="headerlink" title="下载"></a>下载</h2><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">1.用node 第三方包 去下载github 上下载一个东西 第三方包 download-git-repo</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> download = <span class="built_in">require</span>(<span class="string">&#x27;download-git-repo&#x27;</span>)</span><br><span class="line"><span class="comment">//这里面的下载路地址规则是 github:+ 你github上浏览器地址的的后半段 第二个参数 是要存放的路径</span></span><br><span class="line">download(<span class="string">&#x27;github:wazer1987/mini_VueRouter&#x27;</span>,<span class="string">&#x27;../test&#x27;</span>,<span class="function"><span class="params">err</span> =&gt;</span> &#123;</span><br><span class="line">    <span class="built_in">console</span>.log(err?<span class="string">&#x27;下载失败&#x27;</span>:<span class="string">&#x27;下载成功&#x27;</span>)</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
<h2 id="进度条"><a href="#进度条" class="headerlink" title="进度条"></a>进度条</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> 主要使用node  ora模块 需要安装</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//这样就会又提示的字样了</span></span><br><span class="line"><span class="keyword">const</span> adress = <span class="string">&#x27;github:wazer1987/mini_VueRouter&#x27;</span></span><br><span class="line"><span class="keyword">const</span> download = <span class="built_in">require</span>(<span class="string">&#x27;download-git-repo&#x27;</span>)</span><br><span class="line"><span class="keyword">const</span> ora = <span class="built_in">require</span>(<span class="string">&#x27;ora&#x27;</span>)</span><br><span class="line"><span class="keyword">const</span> process = ora(<span class="string">`正在下载.....<span class="subst">$&#123;adress&#125;</span>`</span>)</span><br><span class="line"><span class="comment">//进度条开始</span></span><br><span class="line">process.start()</span><br><span class="line">download(adress,<span class="string">&#x27;./test&#x27;</span>,<span class="function"><span class="params">err</span> =&gt;</span> &#123;</span><br><span class="line">    <span class="keyword">if</span>(err)&#123;</span><br><span class="line">        <span class="comment">//如果下载失败了 进度条关闭 </span></span><br><span class="line">        process.fail()</span><br><span class="line">    &#125;<span class="keyword">else</span>&#123;</span><br><span class="line">        <span class="comment">//如果下载成功 显示成功</span></span><br><span class="line">        process.succeed()</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
<h2 id="封装模块"><a href="#封装模块" class="headerlink" title="封装模块"></a>封装模块</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span>我们上面的那个下载已经写好了现在需要封装成函数 然后导出</span><br><span class="line"><span class="number">2.</span>然后在别的文件里导入这个导出的模块 基本上这样一个封装的模块就写好了</span><br><span class="line"><span class="number">3.</span>这里我们使用<span class="keyword">async</span> 和 <span class="keyword">await</span> 去是用</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span>导出的文件模块 base.js</span><br><span class="line"><span class="keyword">const</span> download = <span class="built_in">require</span>(<span class="string">&#x27;download-git-repo&#x27;</span>)</span><br><span class="line"><span class="keyword">async</span> <span class="function"><span class="keyword">function</span> <span class="title">clone</span>(<span class="params">adress,desc</span>) </span>&#123;</span><br><span class="line">    </span><br><span class="line">    <span class="keyword">const</span> ora = <span class="built_in">require</span>(<span class="string">&#x27;ora&#x27;</span>)</span><br><span class="line">    <span class="keyword">const</span> process = ora(<span class="string">`正在下载.....<span class="subst">$&#123;adress&#125;</span>`</span>)</span><br><span class="line">    <span class="comment">//进度条开始</span></span><br><span class="line">    process.start()</span><br><span class="line">    <span class="keyword">try</span>&#123;</span><br><span class="line">        <span class="keyword">await</span> download(adress,desc)</span><br><span class="line">    &#125;<span class="keyword">catch</span>(e)&#123;</span><br><span class="line">        process.fail()</span><br><span class="line">    &#125;</span><br><span class="line">    process.succeed()</span><br><span class="line">&#125;</span><br><span class="line"><span class="built_in">module</span>.exports.clone = clone</span><br><span class="line"><span class="number">2.</span>在clone.js 文件里 引入 刚刚导出的模块</span><br><span class="line"><span class="keyword">const</span> &#123;clone&#125; = <span class="built_in">require</span>(<span class="string">&#x27;./base.js&#x27;</span>)</span><br><span class="line"><span class="comment">//调用即可</span></span><br><span class="line">clone(<span class="string">&#x27;github:wazer1987/mini_VueRouter&#x27;</span>,<span class="string">&#x27;./test&#x27;</span>)</span><br></pre></td></tr></table></figure>
<h2 id="fs对象"><a href="#fs对象" class="headerlink" title="fs对象"></a>fs对象</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span>主要是对文件进行相关的操作</span><br><span class="line"><span class="number">2.</span>比如读取 写入等</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//文件的读取</span></span><br><span class="line"><span class="keyword">const</span> fs = <span class="built_in">require</span>(<span class="string">&#x27;fs&#x27;</span>)</span><br><span class="line"><span class="comment">//读取了上一级下的base文件 这个是同步读取</span></span><br><span class="line"><span class="keyword">const</span> data = fs.readFileSync(<span class="string">&#x27;../base.js&#x27;</span>)</span><br><span class="line"><span class="built_in">console</span>.log(data)</span><br><span class="line"><span class="comment">//下面是在控制器下打印的东西 读取的是二进制的数据</span></span><br><span class="line">&lt;Buffer 2f 2f <span class="number">20</span> <span class="number">63</span> 6f 6e <span class="number">73</span> <span class="number">74</span> <span class="number">20</span> 6f <span class="number">73</span> <span class="number">20</span> 3d <span class="number">20</span> <span class="number">72</span> <span class="number">65</span> <span class="number">71</span> <span class="number">75</span> <span class="number">69</span> <span class="number">72</span> <span class="number">65</span> <span class="number">28</span> <span class="number">27</span> 6f <span class="number">73</span> <span class="number">27</span> <span class="number">29</span> <span class="number">20</span> 2f 2f e5 <span class="number">86</span> <span class="number">85</span> e5 ad <span class="number">98</span> e6 a8 a1 e5 9d <span class="number">97</span> 0d 0a 2f 2f <span class="number">20</span> 2f 2f e6 ... <span class="number">619</span> more bytes&gt;</span><br><span class="line"><span class="comment">//为了能看到 所以我们这里要toString 这里 转换的是Buffer的二进制</span></span><br><span class="line"><span class="built_in">console</span>.log(data.toString())</span><br><span class="line">下面就是你文件里面的功能了</span><br><span class="line"><span class="comment">// const os = require(&#x27;os&#x27;) //内存模块</span></span><br><span class="line"><span class="comment">// //比如我现在想看 内存使用了多少</span></span><br><span class="line"><span class="comment">// // os.freemem() 空闲内存量 os.totalmem() 总内存量</span></span><br><span class="line"><span class="comment">// const men = os.freemem() / os.totalmem()</span></span><br><span class="line"><span class="comment">// console.log(&#x27;内存使用情况&#x27;,men)</span></span><br><span class="line"><span class="comment">// const ora = require(&#x27;ora&#x27;)</span></span><br><span class="line"><span class="comment">// console.log(ora)</span></span><br><span class="line"><span class="keyword">const</span> download = <span class="built_in">require</span>(<span class="string">&#x27;download-git-repo&#x27;</span>)</span><br><span class="line"></span><br><span class="line"><span class="keyword">async</span> <span class="function"><span class="keyword">function</span> <span class="title">clone</span>(<span class="params">adress,desc</span>) </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">const</span> ora = <span class="built_in">require</span>(<span class="string">&#x27;ora&#x27;</span>)</span><br><span class="line">    <span class="keyword">const</span> process = ora(<span class="string">`正在下载.....<span class="subst">$&#123;adress&#125;</span>`</span>)</span><br><span class="line">    <span class="comment">//进度条开始</span></span><br><span class="line">    process.start()</span><br><span class="line">    <span class="keyword">try</span>&#123;</span><br><span class="line">        <span class="keyword">await</span> download(adress,desc)</span><br><span class="line">    &#125;<span class="keyword">catch</span>(e)&#123;</span><br><span class="line">        process.fail()</span><br><span class="line">    &#125;</span><br><span class="line">    process.succeed()</span><br><span class="line">&#125;</span><br><span class="line"><span class="built_in">module</span>.exports.clone = clone</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//异步读取 fs.readFile(&#x27;路径&#x27;,(err,data) =&gt; &#123;&#125;)</span></span><br><span class="line"><span class="comment">//异步读取 第一个参数 是你要读取路径的地址 第二个参数 是异步的回调 形参 是错误 和你成功读取的数据</span></span><br><span class="line"><span class="keyword">const</span> data = fs.readFile(<span class="string">&#x27;../base.js&#x27;</span>,<span class="function">(<span class="params">err,data</span>) =&gt;</span> &#123;</span><br><span class="line">    <span class="keyword">if</span>(err) <span class="keyword">throw</span> err</span><br><span class="line">    <span class="built_in">console</span>.log(data.toString())</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">几个常用的操作</span><br><span class="line">fs.mkdir(<span class="string">&#x27;文件夹名称&#x27;</span>,<span class="function">() =&gt;</span> &#123;&#125;)</span><br><span class="line">fs.appendFile(<span class="string">&#x27;要追加到那个文件里&#x27;</span>,<span class="string">&#x27;要追加的内容&#x27;</span>,<span class="function">() =&gt;</span> &#123;&#125;)</span><br><span class="line"><span class="comment">//读取一个文件夹下的所有文件</span></span><br><span class="line"><span class="keyword">const</span> data = glob.sync(<span class="string">&#x27;./modules/*&#x27;</span>)</span><br><span class="line">data 返回是一个数组 数组的每个元素 是你读取的文件名的路径全称</span><br><span class="line">然后我们开始分割一下即可</span><br><span class="line"><span class="keyword">for</span>(<span class="keyword">var</span> x <span class="keyword">in</span> data)&#123;</span><br><span class="line">    <span class="built_in">console</span>.log(data[x].split(<span class="string">&#x27;/&#x27;</span>))</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h2 id="Buffer-对象"><a href="#Buffer-对象" class="headerlink" title="Buffer 对象"></a>Buffer 对象</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span> Buffer对象是node.js 对二进制数据的一个封装 在node里我们所有的二进制数据读取出来都是Buffer</span><br><span class="line"><span class="number">2.</span> 主要是为了操作二进制数据 </span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> buf1 = Buffer.alloc(<span class="number">10</span>) <span class="comment">//分配资源</span></span><br><span class="line"><span class="built_in">console</span>.log(buf1)</span><br><span class="line"><span class="comment">//打印结果如下 写了一个一个是个字节的二进制数据</span></span><br><span class="line">&lt;Buffer <span class="number">00</span> <span class="number">00</span> <span class="number">00</span> <span class="number">00</span> <span class="number">00</span> <span class="number">00</span> <span class="number">00</span> <span class="number">00</span> <span class="number">00</span> <span class="number">00</span>&gt;</span><br><span class="line"><span class="comment">//a的二进制数据是多少 打印出来的是  a的二进制数据(ascI)表  </span></span><br><span class="line"><span class="keyword">const</span> buf2 = Buffer.from(<span class="string">&#x27;a&#x27;</span>)</span><br><span class="line"><span class="built_in">console</span>.log(buf2,buf2.toString()) <span class="comment">//打印出来是 &lt;Buffer 61&gt; a</span></span><br><span class="line"><span class="keyword">const</span> buf3 = Buffer.from(<span class="string">&#x27;中文&#x27;</span>) <span class="comment">//打印出来是  &lt;Buffer e4 b8 ad e6 96 87&gt;</span></span><br><span class="line"><span class="built_in">console</span>.log(buf3)</span><br><span class="line"><span class="keyword">const</span> buf4 = Buffer.concat([buf2,buf3]) <span class="comment">//把buf2 ,buf3 链接在了一起</span></span><br><span class="line"><span class="built_in">console</span>.log(buf4)  <span class="comment">//打印出来是 &lt;Buffer 61 e4 b8 ad e6 96 87&gt;</span></span><br></pre></td></tr></table></figure>
<h2 id="http操作"><a href="#http操作" class="headerlink" title="http操作"></a>http操作</h2><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">1.最简单的创建了一个http的请求服务 当访问localhost:3000的时候 就给你回复 <span class="string">&#x27;hellow....&#x27;</span></span><br><span class="line">const http = require(<span class="string">&#x27;http&#x27;</span>)</span><br><span class="line">const server = http.createServer((req,res) =&gt; &#123;</span><br><span class="line">    res.end(<span class="string">&#x27;hello ....&#x27;</span>)</span><br><span class="line">&#125;)</span><br><span class="line">server.listen(3000)</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">2.</span>通过判断浏览器地址 去读取文件 返回给浏览器文件</span><br><span class="line"><span class="keyword">const</span> http = <span class="built_in">require</span>(<span class="string">&#x27;http&#x27;</span>)</span><br><span class="line"><span class="keyword">const</span> fs = <span class="built_in">require</span>(<span class="string">&#x27;fs&#x27;</span>)</span><br><span class="line"><span class="keyword">const</span> server = http.createServer(<span class="function">(<span class="params">req,res</span>) =&gt;</span> &#123;</span><br><span class="line">    <span class="keyword">const</span> &#123;url,method&#125; = req</span><br><span class="line">    <span class="comment">//看看你访问的类型</span></span><br><span class="line">    <span class="keyword">if</span>(url ===<span class="string">&#x27;/&#x27;</span> &amp;&amp; method === <span class="string">&#x27;GET&#x27;</span>)&#123;</span><br><span class="line">        <span class="comment">//去读文件</span></span><br><span class="line">        fs.readFile(<span class="string">&#x27;index.html&#x27;</span>,<span class="function">(<span class="params">err,data</span>) =&gt;</span> &#123;</span><br><span class="line">            <span class="comment">//设置响应报文的头</span></span><br><span class="line">            res.statusCode = <span class="number">200</span></span><br><span class="line">            res.setHeader(<span class="string">&#x27;Content-Type&#x27;</span>,<span class="string">&#x27;text/html&#x27;</span>)</span><br><span class="line">            <span class="comment">//给浏览器返回你读取的文件</span></span><br><span class="line">            res.end(data)</span><br><span class="line">        &#125;)</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br><span class="line">server.listen(<span class="number">3000</span>)</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">3.</span>返回一个接口</span><br><span class="line"><span class="keyword">const</span> http = <span class="built_in">require</span>(<span class="string">&#x27;http&#x27;</span>)</span><br><span class="line"><span class="keyword">const</span> fs = <span class="built_in">require</span>(<span class="string">&#x27;fs&#x27;</span>)</span><br><span class="line"><span class="keyword">const</span> server = http.createServer(<span class="function">(<span class="params">req,res</span>) =&gt;</span> &#123;</span><br><span class="line">    <span class="keyword">const</span> &#123;url,method&#125; = req</span><br><span class="line">    <span class="keyword">if</span>(url ===<span class="string">&#x27;/&#x27;</span> &amp;&amp; method === <span class="string">&#x27;GET&#x27;</span>)&#123;</span><br><span class="line">        fs.readFile(<span class="string">&#x27;index.html&#x27;</span>,<span class="function">(<span class="params">err,data</span>) =&gt;</span> &#123;</span><br><span class="line">            res.statusCode = <span class="number">200</span></span><br><span class="line">            res.setHeader(<span class="string">&#x27;Content-Type&#x27;</span>,<span class="string">&#x27;text/html&#x27;</span>)</span><br><span class="line">            res.end(data)</span><br><span class="line">        &#125;)</span><br><span class="line">    &#125;<span class="keyword">else</span> <span class="keyword">if</span>( url === <span class="string">&#x27;/users&#x27;</span> &amp;&amp; method === <span class="string">&#x27;GET&#x27;</span>)&#123;</span><br><span class="line">        <span class="comment">//返回一个接口</span></span><br><span class="line">        <span class="comment">//这是了响应报文的内容类型 </span></span><br><span class="line">        res.writeHead(<span class="number">200</span>,&#123;</span><br><span class="line">            <span class="string">&#x27;ContentType&#x27;</span>:<span class="string">&#x27;appLication/json&#x27;</span></span><br><span class="line">        &#125;)</span><br><span class="line">        res.end(<span class="built_in">JSON</span>.stringify(&#123;</span><br><span class="line">            name:<span class="string">&#x27;老王&#x27;</span></span><br><span class="line">        &#125;))</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br><span class="line">server.listen(<span class="number">3000</span>)</span><br></pre></td></tr></table></figure>
<h2 id="stream-流"><a href="#stream-流" class="headerlink" title="stream 流"></a>stream 流</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span>这里我们比如要用node 复制一张图片 逻辑就是要先读取这个图片 然后在写入这个图片</span><br><span class="line"><span class="comment">//这里是我们的常规操作</span></span><br><span class="line"><span class="keyword">const</span> fs = <span class="built_in">require</span>(<span class="string">&#x27;fs&#x27;</span>)</span><br><span class="line">fs.readFile(<span class="string">&#x27;./123.png&#x27;</span>,<span class="function">(<span class="params">err,data</span>) =&gt;</span> &#123;</span><br><span class="line">    <span class="keyword">if</span>(data)&#123;</span><br><span class="line">        fs.writeFile(<span class="string">&#x27;./conpy.png&#x27;</span>,data,<span class="function">(<span class="params">err</span>) =&gt;</span> &#123;</span><br><span class="line">           <span class="keyword">if</span>(!err)&#123;</span><br><span class="line">               <span class="built_in">console</span>.log(<span class="string">&#x27;复制成功&#x27;</span>)</span><br><span class="line">           &#125;</span><br><span class="line">        &#125;)</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br><span class="line"><span class="comment">//但是这样会存在一个问题 当你访问量多的时候 这个消耗是巨大的 所以我们有了流的概念</span></span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">2.</span>stream 就是类似一个流 流的话 就需要有管道 让你的文件 通过管道流入到 你指定的地点</span><br><span class="line"><span class="keyword">const</span> fs = <span class="built_in">require</span>(<span class="string">&#x27;fs&#x27;</span>)</span><br><span class="line"><span class="comment">//这个流的源头是哪 你要创建一下 就是出发的管道</span></span><br><span class="line"><span class="keyword">const</span> rs = fs.createReadStream(<span class="string">&#x27;./123.png&#x27;</span>)</span><br><span class="line"><span class="comment">//这个流 最终要去哪 你要指定一下 就是最终结束的管道</span></span><br><span class="line"><span class="keyword">const</span> ws = fs.createWriteStream(<span class="string">&#x27;./1234.png&#x27;</span>)</span><br><span class="line"><span class="comment">//上面我们两个管道都已经定义好了 现在要把他们的完整的拼接在一起 一个流 的管道就畅通了</span></span><br><span class="line">rs.pipe(ws)</span><br><span class="line"><span class="comment">//以上就是一个流的概念</span></span><br></pre></td></tr></table></figure>
<p><img src="2.gif" alt=""></p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">3.</span>我们的网页在访问的时候会有img标签 它也是一个get请求 我们可以用headers.accept 拿到它请求的格式 从而来判断 你这个请求是不是图片的请求 然后来写个流</span><br><span class="line"><span class="keyword">const</span> http = <span class="built_in">require</span>(<span class="string">&#x27;http&#x27;</span>)</span><br><span class="line"><span class="keyword">const</span> fs = <span class="built_in">require</span>(<span class="string">&#x27;fs&#x27;</span>)</span><br><span class="line"><span class="keyword">const</span> server = http.createServer(<span class="function">(<span class="params">req,res</span>) =&gt;</span> &#123;</span><br><span class="line">    <span class="keyword">const</span> &#123;url,method,headers&#125; = req</span><br><span class="line">    <span class="keyword">if</span>(url ===<span class="string">&#x27;/&#x27;</span> &amp;&amp; method === <span class="string">&#x27;GET&#x27;</span>)&#123;</span><br><span class="line">        fs.readFile(<span class="string">&#x27;index.html&#x27;</span>,<span class="function">(<span class="params">err,data</span>) =&gt;</span> &#123;</span><br><span class="line">            res.statusCode = <span class="number">200</span></span><br><span class="line">            res.setHeader(<span class="string">&#x27;Content-Type&#x27;</span>,<span class="string">&#x27;text/html&#x27;</span>)</span><br><span class="line">            res.end(data)</span><br><span class="line">        &#125;)</span><br><span class="line">    &#125;<span class="keyword">else</span> <span class="keyword">if</span>( url === <span class="string">&#x27;/users&#x27;</span> &amp;&amp; method === <span class="string">&#x27;GET&#x27;</span>)&#123;</span><br><span class="line">        res.writeHead(<span class="number">200</span>,&#123;</span><br><span class="line">            <span class="string">&#x27;ContentType&#x27;</span>:<span class="string">&#x27;appLication/json&#x27;</span></span><br><span class="line">        &#125;)</span><br><span class="line">        res.end(<span class="built_in">JSON</span>.stringify(&#123;</span><br><span class="line">            name:<span class="string">&#x27;老王&#x27;</span></span><br><span class="line">        &#125;))</span><br><span class="line">    &#125;<span class="keyword">else</span> <span class="keyword">if</span>( method === <span class="string">&#x27;GET&#x27;</span> &amp;&amp; headers.accept.indexOf(<span class="string">&#x27;image/*&#x27;</span>) !== -<span class="number">1</span>)&#123;</span><br><span class="line">        <span class="comment">//就是在这里判断了 你是img 标签发来的请求 这里我们读取了你的url 然后去创建liu 然后随后链接到res里</span></span><br><span class="line">        fs.createReadStream(<span class="string">&#x27;./&#x27;</span>+url).pipe(res)</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br><span class="line">server.listen(<span class="number">3000</span>)</span><br></pre></td></tr></table></figure>
</article><div class="post-copyright"><div class="post-copyright__title"><span class="post-copyright-info"><h>NodeJs</h></span></div><div class="post-copyright__type"><span class="post-copyright-info"><a href="http://example.com/2019/03/25/Node/">http://example.com/2019/03/25/Node/</a></span></div><div class="post-copyright-m"><div class="post-copyright-m-info"><div class="post-copyright-a"><h>作者</h><div class="post-copyright-cc-info"><h>北城韩雨</h></div></div><div class="post-copyright-c"><h>发布于</h><div class="post-copyright-cc-info"><h>2019-03-25</h></div></div><div class="post-copyright-u"><h>更新于</h><div class="post-copyright-cc-info"><h>2019-06-03</h></div></div><div class="post-copyright-c"><h>许可协议</h><div class="post-copyright-cc-info"><a class="icon" rel="noopener" target="_blank" title="Creative Commons" href="https://creativecommons.org/"><i class="fab fa-creative-commons"></i></a><a rel="noopener" target="_blank" title="CC BY-NC-SA 4.0" 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<p>🌟🌟欢迎大家start 🌟🌟</p> <p>欢迎加入博主的前端技术交流群</p> <p style="background:rgba(255,255,255,1);margin:0"> <img src="/img/code.png"></img> </p></div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#node-%E5%9F%BA%E7%A1%80"><span class="toc-text">node 基础</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#node%E7%9A%84%E5%B8%B8%E7%94%A8%E6%A8%A1%E5%9D%97"><span class="toc-text">node的常用模块</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E4%B8%8B%E8%BD%BD"><span class="toc-text">下载</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E8%BF%9B%E5%BA%A6%E6%9D%A1"><span class="toc-text">进度条</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%B0%81%E8%A3%85%E6%A8%A1%E5%9D%97"><span class="toc-text">封装模块</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#fs%E5%AF%B9%E8%B1%A1"><span class="toc-text">fs对象</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Buffer-%E5%AF%B9%E8%B1%A1"><span class="toc-text">Buffer 对象</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#http%E6%93%8D%E4%BD%9C"><span class="toc-text">http操作</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#stream-%E6%B5%81"><span class="toc-text">stream 流</span></a></li></ol></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/2021/04/16/gin-vue-admin/" title="Gin-Vue-Admin"><img src="/img/gin-vue-admin.jpg" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Gin-Vue-Admin"/></a><div class="content"><a class="title" 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